U.S. patent application number 16/034739 was filed with the patent office on 2018-11-08 for power tool.
The applicant listed for this patent is Positec Power Tools (Suzhou) Co., Ltd.. Invention is credited to Yimin Sun, Yu Wu, Hongfeng Zhong.
Application Number | 20180319001 16/034739 |
Document ID | / |
Family ID | 64014465 |
Filed Date | 2018-11-08 |
United States Patent
Application |
20180319001 |
Kind Code |
A1 |
Zhong; Hongfeng ; et
al. |
November 8, 2018 |
Power Tool
Abstract
The invention provides a power tool, including: a motor; an
output shaft for mounting a work head, wherein a plane passing
through an axis of the motor and an axis of the output shaft is
defined as a reference plane; and a housing, including an inner
housing and an outer housing, wherein the inner housing and the
outer housing are spaced, and the motor is at least partially
accommodated in the inner housing; a limiting mechanism and a
vibration reduction mechanism disposed between the outer housing
and the inner housing, and wherein the vibration reduction
mechanism acts in a direction perpendicular to the reference plane,
the limiting mechanism is used for limiting the outer housing to
move relative to the inner housing in the reference plane or a
plane parallel to the reference plane, and the limiting mechanism
and the vibration reduction mechanism are respectively
independent.
Inventors: |
Zhong; Hongfeng; (Suzhou,
CN) ; Wu; Yu; (Suzhou, CN) ; Sun; Yimin;
(Suzhou, CN) |
|
Applicant: |
Name |
City |
State |
Country |
Type |
Positec Power Tools (Suzhou) Co., Ltd. |
Suzhou |
|
CN |
|
|
Family ID: |
64014465 |
Appl. No.: |
16/034739 |
Filed: |
July 13, 2018 |
Related U.S. Patent Documents
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Application
Number |
Filing Date |
Patent Number |
|
|
PCT/CN2017/001045 |
Jan 13, 2017 |
|
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|
16034739 |
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Current U.S.
Class: |
1/1 |
Current CPC
Class: |
B23D 47/005 20130101;
B27B 19/006 20130101; B23D 49/16 20130101; B24B 41/007 20130101;
B23D 45/16 20130101; B25F 5/006 20130101; B24B 23/04 20130101; B25F
3/00 20130101; B24B 23/028 20130101 |
International
Class: |
B25F 5/00 20060101
B25F005/00; B25F 3/00 20060101 B25F003/00 |
Foreign Application Data
Date |
Code |
Application Number |
Jan 14, 2016 |
CN |
201610024022.0 |
Claims
1. A power tool, comprising: a motor; an output shaft for mounting
a work head, wherein the output shaft is driven by the motor, and a
plane passing through an axis of the motor and an axis of the
output shaft is defined as a reference plane; a housing, comprising
an inner housing and an outer housing, wherein the inner housing
and the outer housing are spaced, and the motor is at least
partially accommodated in the inner housing; and a limiting
mechanism and a vibration reduction mechanism disposed between the
outer housing and the inner housing, and wherein the vibration
reduction mechanism acts in a direction perpendicular to the
reference plane, the limiting mechanism is used for limiting the
outer housing to move relative to the inner housing in the
reference plane or a plane parallel to the reference plane, and the
limiting mechanism and the vibration reduction mechanism are
respectively independent.
2. The power tool according to claim 1, wherein the limiting
mechanism comprises a limiting damping member, the vibration
reduction mechanism comprises a vibration reduction damping member,
and material of the limiting damping member is different from that
of the vibration reduction damping member.
3. The power tool according to claim 1, wherein the limiting
mechanism comprises a limiting damping member, the vibration
reduction mechanism comprises a vibration reduction damping member,
and the limiting damping member is different from the vibration
reduction damping member in at least one of the shape and size.
4. The power tool according to claim 1, wherein the limiting
mechanism comprises a limiting damping member, the vibration
reduction mechanism comprises a vibration reduction damping member,
and the density of the limiting damping member is different from
that of the vibration reduction damping member.
5. The power tool according to claim 2, wherein the vibration
reduction damping member is disposed between an outer surface of
the inner housing and an inner surface of the outer housing.
6. The power tool according to claim 5, wherein the vibration
reduction damping member is directly connected to the outer surface
of the inner housing.
7. The power tool according to claim 6, wherein the vibration
reduction damping member is directly connected to the inner surface
of the outer housing.
8. The power tool according to claim 1, wherein the limiting
mechanism comprises a limiting member, a limiting groove
cooperating with the limiting member, and a limiting damping member
disposed between the limiting member and the limiting groove, and
the limiting member is disposed on one of the outer housing and the
inner housing; and the limiting groove is disposed on the other one
of the outer housing and the inner housing.
9. The power tool according to claim 8, wherein the limiting member
is a cylindrical pin.
10. The power tool according to claim 9, wherein in an axial
direction of the cylindrical pin, the length of the limiting
damping member is not greater than the depth of the limiting
groove.
11. The power tool according to claim 9, wherein the limiting
damping member is provided with a through hole for the cylindrical
pin to penetrate through.
12. The power tool according to claim 1, wherein the inner housing
comprises a head housing at least partially accommodating the
output shaft and a motor housing connected to the head housing, and
the limiting mechanism and the vibration reduction mechanism are
disposed between the head housing and the outer housing.
13. The power tool according to claim 12, wherein the limiting
mechanism and the vibration reduction mechanism are disposed
between the motor housing and the outer housing.
14. A power tool, comprising: a motor; an output shaft for mounting
a work head, wherein the output shaft is driven by the motor; a
housing, comprising an inner housing and an outer housing, wherein
the inner housing and the outer housing are spaced, and the motor
is at least partially accommodated in the inner housing, the outer
housing has a longitudinal extending axis, and a plane passing
through an axis of the output shaft and the longitudinal extending
axis is defined as a middle plane; and a limiting mechanism and a
vibration reduction mechanism disposed between the outer housing
and the inner housing, and wherein the vibration reduction
mechanism acts in a direction perpendicular to the middle plane,
the limiting mechanism comprises a limiting damping member, and the
vibration reduction mechanism comprises a vibration reduction
damping member, and the vibration reduction damping member and the
limiting damping member are respectively independent.
15. The power tool according to claim 14, wherein the limiting
mechanism is used for limiting the outer housing to move relative
to the inner housing in the middle plane or a plane parallel to the
middle plane.
16. A power tool, comprising a motor; an output shaft for mounting
a work head, wherein the output shaft is driven by the motor to
oscillate around an axis of the output shaft, and a plane vertical
to the axis of the output shaft is defined as an oscillating plane;
a housing, comprising an inner housing and an outer housing,
wherein the inner housing and the outer housing are spaced, and the
motor is at least partially accommodated in the inner housing; and
a limiting mechanism and a vibration reduction mechanism disposed
between the outer housing and the inner housing, and wherein the
vibration reduction mechanism acts in a direction parallel to the
oscillating plane, the limiting mechanism is used for limiting the
outer housing to move relative to the inner housing in a plane
vertical to the oscillating plane and parallel to the axis of the
output shaft, and the limiting mechanism and the vibration
reduction mechanism are respectively independent.
17. The power tool according to claim 16, wherein the limiting
mechanism comprises a limiting damping member, the vibration
reduction mechanism comprises a vibration reduction damping member,
and material of the limiting damping member is different from that
of the vibration reduction damping member.
18. The power tool according to claim 16, wherein the limiting
mechanism comprises a limiting damping member, the vibration
reduction mechanism comprises a vibration reduction damping member,
and the limiting damping member is different from the vibration
reduction damping member in at least one of the shape and size.
19. The power tool according to claim 16, wherein the limiting
mechanism comprises a limiting member, a limiting groove
cooperating with the limiting member, and a limiting damping member
disposed between the limiting member and the limiting groove, and
the limiting member is disposed on one of the outer housing and the
inner housing; and the limiting groove is disposed on the other one
of the outer housing and the inner housing.
20. The power tool according to claim 19, wherein the limiting
member is a cylindrical pin.
Description
BACKGROUND
Technical Field
[0001] The present invention relates to a power tool.
Related Art
[0002] A power tool, such as an oscillating power tool, usually
includes a housing, a motor accommodated in the housing, an output
shaft for mounting a work head, and an eccentric transmission
mechanism connected between the motor and the output shaft. The
eccentric transmission mechanism converts rotary movement of a
motor shaft into oscillating movement of the output shaft around
the axis per se. In this way, after a free end of the output shaft
is connected to different accessory work heads, such as a straight
saw blade, a circular saw blade, and a triangular dull polishing
tray, the oscillating power tool may implement multiple operations
such as sawing, cutting, polishing, and scraping, to adapt to
different working requirements.
SUMMARY
[0003] An objective of the present invention is directed to
providing a power tool that is comfortable to operate and high in
working efficiency.
[0004] According to the power tool of the present invention, a
limiting mechanism and a vibration reduction mechanism are
relatively independently disposed, and then the most appropriate
material, shape, size and the like can be selected according to
respective characteristics. Therefore, the vibration reduction
effect is ensured without affecting working efficiency. Besides,
the limiting mechanism and the vibration reduction mechanism are
flexible to dispose, and the whole machine is compact in structure
and better in man-machine interaction.
BRIEF DESCRIPTION OF THE DRAWINGS
[0005] The foregoing objective, technical solutions, and beneficial
effects of the present invention can be implemented by means of the
following accompanying drawings.
[0006] FIG. 1 is a front view of an oscillating power tool
according to a first implementation of the present invention;
[0007] FIG. 2 is a schematic diagram of the oscillating power tool
shown in FIG. 1 with half of an outer housing removed;
[0008] FIG. 3 is a partial stereoscopic diagram of the oscillating
power tool shown in FIG. 1;
[0009] FIG. 4 is a partial stereoscopic exploded view of the
oscillating power tool shown in FIG. 1;
[0010] FIG. 5 is a sectional view along an A-A line in FIG. 1;
[0011] FIG. 6 is a schematic diagram of an oscillating power tool
with half of an outer housing hidden according to a second
implementation of the present invention;
[0012] FIG. 7 is a partial stereoscopic exploded view of the
oscillating power tool shown in FIG. 6;
[0013] FIG. 8 is a sectional view of the oscillating power tool
shown in FIG. 6;
[0014] FIG. 9 is a sectional view of an oscillating power tool
according to a third implementation of the present invention;
[0015] FIG. 10 is a schematic diagram of an oscillating power tool
with half of an outer housing hidden according to a fourth
implementation of the present invention;
[0016] FIG. 11 is a partial stereoscopic exploded view of the
oscillating power tool shown in FIG. 10; and
[0017] FIG. 12 is a sectional view of the oscillating power tool
shown in FIG. 10.
DETAILED DESCRIPTION
[0018] The present invention is further described in detail with
reference to the accompanying drawings and specific
implementations.
[0019] In the present implementation, an oscillating power tool is
used as an example to illustrate a creative concept of the present
invention, and the oscillating power tool is also referred to as an
oscillating power tool. However, the power tool of the present
invention is not limited to the oscillating power tool, and may
also be a rotary power tool, such as a sanding machine or an angle
grinder.
[0020] FIG. 1 to FIG. 5 show a first implementation of the present
invention.
[0021] Referring to FIG. 1, an oscillating power tool 100 includes
a housing 32, an output shaft 34 extending from the interior of the
housing 32, a work head (not shown) mounted on a tail end of the
output shaft 34, and a clamping component 36 used for clamping the
work head in an axial direction 33 of the output shaft. The axial
direction 33 approximately extends along an axis Y parallel to the
output shaft 34.
[0022] The housing 32 includes an inner housing 38 and an outer
housing 40 that are spaced. The outer housing 40 extends
approximately along a straight line; a longitudinal extending axis
of the outer housing 40 is X1, and the inner housing 38 partially
bends and extends relative to the outer housing 40 from one end of
the outer housing 40. The outer housing 40 has a holding area 42,
and the user holds the holding area 42 in a process of guiding the
tool.
[0023] A plane that the longitudinal extending axis X1 of the outer
housing 40 and the axis Y of the output shaft pass through is
defined as a middle plane, that is, when the longitudinal extending
axis X1 of the outer housing 40 and the axis Y of the output shaft
are coplanar, the middle plane is formed. In this embodiment, the
longitudinal extending axis X1 of the outer housing 40 is
approximately perpendicular to the axis Y of the output shaft.
Those skilled in the art can conceive of that the longitudinal
extending axis X1 of the outer housing 40 and the axis Y of the
output shaft may not be coplanar or coplanar but not perpendicular.
For example, the longitudinal extending axis X1 of the outer
housing 40 and the axis Y of the output shaft are parallel or form
other angles.
[0024] Referring to FIG. 2, the inner housing 38 includes a head
housing 44 at least partially accommodating the output shaft 34 and
a motor housing 46 connected to the head housing 44. The motor
housing 46 is used for mounting the motor 48, and the motor 48 has
a motor shaft 47 (referring to FIG. 3). The motor housing 46 may be
designed to partially or completely cover the motor 48 according to
requirements. In this embodiment, the head housing 44 is made of
metal, and the motor housing 46 is made of plastic. Certainly, the
head housing 44 and the motor housing 46 may be made of metal or
plastic according to requirements. The motor housing 46 in this
embodiment consists of two parts, which are respectively disposed
on two ends of the motor 48 and partially cover the motor 48, and
the middle part of the motor 48 is not covered in the motor housing
46. The motor housing 46 may also be integrally formed, and in this
case, the motor housing 46 may completely cover the motor 48.
[0025] Referring to FIG. 3, an eccentric transmission mechanism 50
is disposed between the motor shaft 47 and the output shaft 34. A
rotary movement of the motor 48 around an axis X2 of the motor 48
is converted into an oscillating movement of the output shaft 34
around an axis Y of the output shaft 34 by the eccentric
transmission mechanism 50, and an oscillating direction is shown by
an arrow R-R in the drawing. When a free end of the output shaft 34
is connected to different work head accessories, such as a straight
saw blade, a circular saw blade, and a triangular dull polishing
tray, the oscillating power tool may implement operations such as
cutting or grinding.
[0026] A plane that the axis X2 of the motor and the axis Y of the
output shaft pass through is defined as a reference plane, that is,
when the axis X2 of the motor and the axis Y of the output shaft
are coplanar, the reference plane is formed. In this embodiment,
the axis Y of the output shaft is approximately perpendicular to
the axis X2 of the motor. Those skilled in the art may conceive of
that the axis X2 of the motor and the axis Y of the output shaft
may not be coplanar or coplanar but not perpendicular. For example,
the axis X2 of the motor and the axis Y of the output shaft are
parallel or form other angles.
[0027] Certainly, in this embodiment, the axis X2 of the motor and
the longitudinal extending axis X1 of the outer housing 40 overlap,
and therefore, the reference plane and the middle plane
overlap.
[0028] A plane formed by movement of the work head is defined as a
working plane, specific to this embodiment, the oscillating of the
work head (may be a straight saw blade, a circular saw blade, or
the like) forms an oscillating plane perpendicular to the axis Y of
the output shaft along with the output shaft 34. The oscillating
plane may be considered as a plane formed by oscillating of any one
straight line perpendicular to the output shaft 34 on the work head
along with the output shaft 34. Therefore, the oscillating plane is
perpendicular to the foregoing middle plane or reference plane.
Certainly, those skilled in the art may also conceive of that for
the rotary power tool, the work head rotates along with the output
shaft to form a rotary plane.
[0029] Continuing to refer to FIG. 3, the eccentric transmission
mechanism 50 is disposed in the head housing 44 and includes a
shifting fork 52 and an eccentric component 54 connected to the
motor shaft 47. The eccentric component 54 includes an eccentric
shaft 56 connected to the motor shaft 47 and a drive wheel 58
mounted on the eccentric shaft 56. One end of the shifting fork 52
is connected to the top of the output shaft 34, and the other end
matches the drive wheel 58 of the eccentric component 54. The
shifting fork 52 includes a sleeve 60 sleeved on the output shaft
34 and a forklike part 62 horizontally extending from the top end
of the sleeve 60 to the motor shaft 47 vertically. In the present
implementation, the drive wheel 58 is a ball bearing, and has a
spherical external surface matching the forklike part 62 of the
shifting fork 52. The eccentric shaft 56 is eccentrically connected
to the motor shaft 47, that is, an axis X3 of the eccentric shaft
56 does not overlap with the axis X1 of the motor shaft 47 and is
radially offset from the axis X1 of the motor shaft 47 by a certain
interval. The forklike part 62 of the shifting fork 52 covers two
sides of the drive wheel 58 and gets in tight sliding contact with
the outer surface of the drive wheel 58.
[0030] When the motor 48 drives the motor shaft 47 to rotate, the
eccentric shaft 56 eccentrically rotates relative to the axis X2 of
the motor under driving of the motor shaft 47, and further, the
drive wheel 58 is driven to eccentrically rotate relative to the
axis X2 of the motor. Under driving of the drive wheel 58, the
shifting fork 52 oscillates relative to the axis Y of the output
shaft, and further drives the output shaft 34 to oscillate around
the axis Y per se. Oscillating of the output shaft 34 drives the
work head mounted thereon to oscillate, so as to machine a
workpiece.
[0031] In this embodiment, an oscillating angle of the output shaft
34 is 5.degree., and an oscillating frequency of the output shaft
34 is 18000 times per minute. By setting the oscillating angle of
the output shaft to be 5.degree., working efficiency of the work
head is greatly improved, and when the work head is a saw blade,
chippings are convenient to discharge.
[0032] It needs to be pointed out that according to the oscillating
power tool of the present invention, the oscillating angle of the
output shaft 34 is not limited only to 5.degree., and may be set as
a value greater than or less than 5.degree. according to
requirements. The oscillating frequency of the output shaft 34 is
not limited to 18000 times per minute, either, and preferably
greater than 10000 times per minute.
[0033] Since the housing 32 includes an inner housing 38 and an
outer housing 40, in order to limit movement of the outer housing
40 relative to the inner housing, a limiting mechanism is disposed
between the inner housing 38 and the outer housing 40. The limiting
mechanism is mainly used to limit the outer housing 40 to move,
relative to the inner housing 38, in the reference plane and a
plane parallel to the reference plane. It needs to be pointed out
that the movement of the outer housing and the inner housing
mentioned herein is not necessary to be completely and precisely
limited to the movement in the reference plane or the plane
parallel to the reference plane. Because of complexity of an actual
working condition, the reference plane may generate tiny overturn,
and the movement limitation of the limiting mechanism to the outer
housing and the inner housing also includes a case in which the
reference plane has the tiny overturn. Further, it needs to be
pointed out that the limited movement includes the movements and
rotations in these planes.
[0034] In another case, the limiting mechanism is mainly used to
limit the outer housing 40 to move relative to the inner housing 38
in the middle plane and the plane parallel to the middle plane. It
needs to be pointed out that the movement of the outer housing and
the inner housing mentioned herein is not necessary to be
completely and precisely limited to the movement in the middle
plane or the plane parallel to the middle plane. Because of
complexity of an actual working condition, the middle plane may
generate tiny overturn, and the movement limitation of the limiting
mechanism to the outer housing and the inner housing also includes
a case in which the middle plane has the tiny overturn. Further, it
needs to be pointed out that the limited movement includes the
movements and rotations in these planes.
[0035] In another case, the limiting mechanism is mainly used to
limit the movement of the outer housing 40 relative to the inner
housing 38 in a plane perpendicular to the oscillating plane or
working plane and parallel to the axis of the output shaft or the
longitudinal extending axis of the outer housing 40.
[0036] In this embodiment, the limiting mechanism is disposed
between the head housing 44 and the outer housing 40, and between
the motor housing 46 and the outer housing 40. Certainly, the
limiting mechanism may also be disposed only between the head
housing 44 and the outer housing 40 or only between the motor
housing 46 and the outer housing 40.
[0037] A limiting mechanism is disposed on at least one side of the
middle plane. In this embodiment, the limiting mechanisms are
symmetrically disposed on two sides of the middle plane.
[0038] A case in which the limiting mechanism is located only
between the head housing 44 and the outer housing 40 and located on
one side of the middle plane is used as an example for specific
illustration below.
[0039] Referring to FIG. 4 and FIG. 5, the limiting mechanism
includes a limiting member 64, a limiting groove 66 matching the
limiting member 64, and a limiting damping member 68 disposed
between the limiting member 64 and the limiting groove 66. The
limiting member 64 is disposed on at least one of the head housing
44 and the outer housing 40 and the limiting groove 66 is disposed
on the other one of the head housing 44 and the outer housing
40.
[0040] In this embodiment, the limiting member 64 is disposed on
the outer housing 40, and extends to the head housing 44 from the
inner surface 70 of the outer housing 40. The limiting member is a
cylindrical pin, and is integrally formed on the outer housing 40.
Certainly, the limiting member may also be fixedly disposed on the
inner surface 70 of the outer housing 40.
[0041] The limiting groove 66 is disposed in the head housing 44,
and is used to accommodate the limiting member 64. The limiting
member 64 and the limiting groove 66 are circular, and in this way,
a liming function is achieved in each direction of the reference
plane or the middle plane. Similarly, transmission of vibration and
the like may also be reduced in each direction of the reference
plane or the middle plane.
[0042] Certainly, the shapes of the limiting member 64 and the
limiting groove 66 are not limited to be circular, and may also be
polygonal, oval, or the like. Besides, the shape of the limiting
member may be different from that of the limiting groove.
[0043] The limiting damping member 68 is provided with an
accommodating hole 72, which is a cylindrical hole for the
cylindrical pin 64 to penetrate through. Certainly, the shape of
the accommodating hole 72 may change along with the shape of the
limiting member. In this embodiment, the accommodating hole 72 is a
through hole. Certainly, the accommodating hole 72 may also have a
bottom surface, but the cylindrical pin 64 does not need to contact
the bottom surface of the accommodating hole 72.
[0044] Since the limiting damping member 68 does not need to
provide a vibration reduction function in a direction perpendicular
to the middle plane or the reference plane, in a direction
perpendicular to the middle plane or the reference plane for the
limiting member 64, that is, in the axial direction per se, the
length of the limiting damping member 68 may be not greater than
the depth of the limiting groove 66.
[0045] In a working process of the oscillating power tool 100, a
workpiece generates a hinder force to feeding of the work head;
then the work head transmits the force to the output shaft, and
further transmits to the inner housing 38 from the output shaft;
the force is transmitted to the outer housing 40 through the
limiting damping member 68 between the inner housing and the outer
housing, and further the force is transmitted to the hand of a user
who holds the oscillating power tool 100 from the outer housing 40.
Therefore, the limiting damping member 68 uses a material with
relatively large rigidity, thus it is favorable to improve the
operation performance of the oscillating power tool and convenient
for the user to more easily operate the oscillating power tool to
smoothly feed the work head.
[0046] In the working process of the oscillating power tool 100, a
main vibration source exists in a direction parallel to the
oscillating plane, and therefore, a vibration reduction mechanism
is disposed between the inner housing 38 and the outer housing 40,
and a main acting direction of the vibration reduction mechanism is
parallel to the oscillating plane or the working plane. That is,
the vibration reduction mechanism mainly acts in the direction
perpendicular to the reference plane or the middle plane.
[0047] By disposing the vibration reduction mechanism, the
vibration generated in the working process is effectively prevented
from being transmitted to the outer housing 40 through the inner
housing 38, and further prevented from being transmitted to the
holding area 42. The vibration transmitted to the holding area 42
is reduced, and the problem of hand numbing caused by vibration in
the use process of the user is greatly improved, and a comfort
level in operation is improved.
[0048] In this embodiment, the vibration reduction mechanism is
disposed between the head housing 44 and the outer housing 40 and
between the motor housing 46 and the outer housing 40. Certainly,
the vibration reduction mechanism may also be disposed only between
the head housing 44 and the outer housing 40 or between the motor
housing 46 and the outer housing 40.
[0049] The vibration reduction mechanism is disposed on at least
one side of the middle plane. However, in this embodiment, the
vibration reduction mechanisms are symmetrically disposed on two
sides of the middle plane.
[0050] A case in which the vibration reduction mechanism is located
between the head housing 44 and the outer housing 40 and located on
one side of the middle plane is only used as an example for
specific illustration below. Referring to FIG. 4 and FIG. 5, the
vibration reduction mechanism includes a vibration reduction
damping member 76 disposed between the head housing 44 and the
outer housing 40.
[0051] Specifically, in this embodiment, the vibration reduction
damping member 76 is disposed between the outer surface 74 of the
inner housing 38 and the inner surface 70 of the outer housing 40.
The number of the vibration reduction damping member 76 may be N (N
is 1, 2 . . . and other integers), and in this embodiment, the
number of the vibration reduction damping members 76 is two.
[0052] The vibration reduction damping member 76 can have a shape
suitable for subsequent placing in a state of not being placed. For
example, the vibration reduction damping member 76 is a cuboid in
the state of not being placed and is changed in shape by using a
prestress in the state of being placed. Therefore, the generation
of the prestress may generate an extremely favorable influence on
the interior of the vibration reduction damping member 76. The
proper prestress is particularly between 20% and 40%, and
preferably 35%.
[0053] The vibration reduction damping member 76 is connected to
the inner surface 70 of the outer housing 40. The inner surface 70
contacting the vibration reduction damping member 76 of the outer
housing 40 is machined into a support surface, which is
approximately convex-shaped.
[0054] The vibration reduction damping member 76 is connected to
the outer surface 74 of the inner housing 38. The outer surface 74
contacting the vibration reduction damping member 76 of the inner
housing 38 is machined into a support surface, which is
approximately planar.
[0055] In addition, the inner surface 70 contacting the vibration
reduction damping member 76 of the outer housing 40 may be machined
to be planar; the outer surface 74 contacting the vibration
reduction damping member 76 of the inner housing 38 may be machined
to be the support surface, which is approximately convex-shaped; or
each of the outer surface 74 and the inner surface 70 may be
machined into the support surface, which is planar.
[0056] Since the vibration reduction mechanism and the limiting
mechanism are relatively independently disposed, the vibration
reduction damping member 76 may be directly connected to the inner
surface 70 of the outer housing 40 and the outer surface 74 of the
inner housing 38. Besides, the vibration reduction damping member
76 may be manufactured into any shape fitted to the outer surface
of the inner housing 38 and the inner surface of the outer housing
40 according to requirements.
[0057] In this embodiment, the vibration reduction damping member
76 is a cuboid in a state of not being placed, and is changed in
shape under the action of the prestress after being placed, and a
surface contacting the inner surface 70 of the outer housing 40 is
recessed-shaped. Certainly, the limiting mechanism is mainly used
to limit the outer housing 40 to move relative to the inner housing
38 in the reference plane or the middle plane; and the vibration
reduction mechanism mainly plays a role in a direction
perpendicular to the reference plane or the middle plane.
Therefore, the vibration reduction mechanism and the limiting
mechanism are relatively independently disposed. For example, the
vibration reduction mechanism and the limiting mechanism may be
adjacently or separately disposed. In this way, the most
appropriate shapes, sizes, and materials of the vibration reduction
damping member 76 and the limiting damping member 68 may be
selected according to respective functions. Therefore, the
vibration reduction effect is ensured without affecting the working
efficiency.
[0058] The vibration reduction mechanism and the limiting mechanism
are relatively independently disposed. Therefore, the vibration
reduction mechanism is disposed on at least one side of the middle
plane; when disposed on both sides, the vibration reduction
mechanisms may be symmetrically disposed, and certainly, may also
be disposed in a staggering manner. However, the position of the
limiting mechanism is more flexibly disposed, and similar to the
vibration reduction mechanism, the limiting mechanism may be
disposed on one side or two sides of the middle plane; and more
flexibly, the limiting mechanism may be partially located in the
middle plane. Therefore, specific setting may be performed
according to a specific shape of the oscillating power tool 100;
besides, the diameter of the holding area 42 may be reduced, and
the structure is more compact, to facilitate holding.
[0059] Then referring to FIG. 4 and FIG. 5, the case in which the
limiting mechanism and the vibration reduction mechanism are
located between the head housing 44 and the outer housing 40 and
located on one side of the middle plane is still used as an
example. In this embodiment, the vibration reduction mechanism and
the limiting mechanism are adjacently disposed. The vibration
reduction mechanism includes two vibration reduction damping
members 76, and the limiting damping member 68 of the limiting
mechanism is disposed between the two vibration reduction damping
members 76. The two vibration reduction damping members 76 and the
limiting damping member 68 are sequentially disposed along an axial
direction 33 of the output shaft. The two vibration reduction
damping members 76 are symmetrically disposed relative to the
limiting damping member 68, and connecting lines of centers of the
three extends along the axial direction 33 of the output shaft.
[0060] The vibration reduction damping members 76 and the limiting
damping member 68 are spaced and do not interfere with each other.
Specifically referring to FIG. 4, the vibration reduction damping
members 76 and the limiting damping member 68 are spaced by an
outer wall 80 (a part of the head housing 44) of the limiting
groove 66. The vibration reduction damping members 76 and the outer
wall 80 of the limiting groove 66 are spaced by a certain distance.
Certainly, the vibration reduction damping members 76 may also
contact the outer wall 80.
[0061] The vibration reduction damping members 76 and the limiting
damping member 68 both have certain elasticity, and use
polyurethane (PU), ethylene-propylene-diene monomer (EPDM),
polypropylene (EPP), rubber, a mixture thereof, and the like. These
materials are used between the inner housing 38 and the outer
housing 40, and in combination with a proper prestress, the comfort
level in operation is improved while the user holds the holding
area 42 to guide the tool.
[0062] In this embodiment, both the vibration reduction damping
members 76 and the limiting damping member 68 are preferably made
of PU. Certainly, the vibration reduction damping members 76 and
the limiting damping member 68 may also use different materials.
For example, the vibration reduction damping members 76 use PU and
the limiting damping member 68 use EPP, and the like.
[0063] The vibration reduction damping members 76 and the limiting
damping member 68 use PU, and a density is generally 0.3 g/cm.sup.3
to 0.8 g/cm.sup.3. The density of the vibration reduction damping
members 76 is preferably 0.45 g/cm.sup.3 to 0.55 g/cm.sup.3, and
the density of the limiting damping member 68 is preferably 0.6
g/cm.sup.3 to 0.7 g/cm.sup.3. Therefore, the density of the
vibration reduction damping members 76 and that of the limiting
damping member 68 may be the same, but may also be different to
some extent. Preferably, a material density of the vibration
reduction damping members 76 is less than that of the limiting
damping member 68.
[0064] Besides, the vibration reduction damping members 76 and the
limiting damping member 68 are spaced. Therefore, the vibration
reduction damping members 76 and the limiting damping member 68 may
be the same or different in shape, size or number according to
requirements.
[0065] For example, in this embodiment, in a state of not being
placed between the outer surface 74 of the inner housing 38 and the
inner surface 70 of the outer housing 40, the vibration reduction
member 76 is approximately a cuboid, but after being placed, one
surface contacting the inner surface 70 of the outer housing 40 is
approximately recessed-shaped, but the limiting damping member 68
is approximately cylindrical in both states of being placed and not
being placed. In addition, the size and the number are both
different. Certainly, the shape and the number of the vibration
reduction damping members 76 and the limiting damping member 68 are
not limited only to this embodiment, and may be set according to a
specific space.
[0066] In this embodiment, the two vibration reduction damping
members 76 are spaced by a certain distance, and in this way, a
span of the vibration reduction mechanism in the axial direction 33
of the output shaft is increased; a greater span indicates a better
vibration reduction effect, and meanwhile, the vibration reduction
mechanism provides enough support for the head housing 44 in the
axial direction 33 of the output shaft, and a movement angle of the
head housing 44 relative to the outer housing 40 is relatively
small, and reduction of working efficiency is obviously
avoided.
[0067] Preferably, a maximal length of the head housing 44 for
accommodating part of the output shaft 34 along the axial direction
33 of the output shaft is L; a distance L1 (span) between two
farthest points of the two vibration reduction damping members 76
along the axial direction 33 of the output shaft is greater than or
equal to 0.2 L and less than or equal to 0.8 L. Preferably, the
distance L1 between two farthest points of the two vibration
reduction damping members 76 along the axial direction 33 of the
output shaft is greater than or equal to 0.4 L and less than or
equal to 0.7 L. Preferably, the distance L1 between two farthest
points of the two vibration reduction damping members 76 along the
axial direction 33 of the output shaft is 0.5 L or 0.6 L.
[0068] Certainly, a sum L2 of the lengths of the two vibration
reduction damping members 76 along the axial direction 33 of the
output shaft is greater than or equal to 0.2 L and less than or
equal to 0.8 L, so that a good vibration reduction effect may also
be achieved and reduction of working efficiency is obviously
avoided. Preferably, the sum L2 of the lengths of the two vibration
reduction damping members 76 along the axial direction 33 of the
output shaft is greater than or equal to 0.3 L and less than or
equal to 0.6 L. Preferably, the sum L2 of the lengths of the two
vibration reduction damping members 76 along the axial direction 33
of the output shaft is 0.4 L or 0.5 L.
[0069] Referring to FIG. 2 again, in this embodiment, the vibration
reduction mechanism and the limiting mechanism disposed between the
motor housing 46 and the outer housing 40 are basically the same as
those disposed between the head housing 44 and the outer housing,
and a difference lies in that lines connecting centers of the two
vibration reduction damping members 76 and the limiting damping
member 68 are not located on the same straight line, and the lines
connecting the three centers form a triangle. Such arrangement may
also ensure that the working efficiency is not affected when the
vibration reduction effect is ensured. In addition, the vibration
reduction damping members 76 may also have a shape different from
the cuboid shape in the head housing 44, for example, a cuboid with
one or more angles cut off. Thus, it can be seen that the positions
of the vibration reduction damping members 76 and the limiting
damping member 68 are flexibly disposed and may be disposed
according to a specific shape of the oscillating power tool 100,
and the structure is more compact.
[0070] FIG. 6 to FIG. 8 show a second implementation of the present
invention.
[0071] As shown in FIG. 6 to FIG. 8, this embodiment is
approximately similar to the first embodiment. In this embodiment,
an oscillating power tool 200 and its general layout and limiting
mechanism are all the same as those in the first embodiment, and
the difference lies in the setting of the vibration reduction
mechanism. In the present implementation, a vibration reduction
mechanism is disposed between a head housing 244 and an outer
housing 240 and a vibration reduction mechanism is also disposed
between a motor housing 246 and the outer housing 240. Besides, the
vibration reduction mechanisms are symmetrically disposed on two
sides of a middle plane.
[0072] A case in which the vibration reduction mechanism is located
between the head housing 244 and the outer housing 240 and located
on one side of the middle plane is used as an example for
illustration below. The vibration reduction mechanism includes a
vibration reduction damping member 276. The vibration reduction
damping member 276 is in an approximately annular cylindrical
structure, and two bottom surfaces of a cylinder are a first bottom
surface 231a and a second bottom surface 233b of the vibration
reduction damping member 276. The vibration reduction damping
member 276 includes an inner hole 277, and the inner hole 277 is
approximately cylindrical and has an inner side wall.
[0073] Further, the vibration reduction damping member 276 is
sleeved on an outer wall 280 of a limiting groove 266.
Specifically, the inner side wall of the vibration reduction
damping member 276 is engaged with the outer wall 280 of the
limiting groove 266, so as to limit a relative position
relationship between the vibration reduction damping member 276 and
the head housing 244, and prevent the vibration reduction damping
member 276 from being offset to other positions upon a repeated
vibration action in the working process of the oscillating power
tool 200.
[0074] Further, the first bottom surface 231a of the vibration
reduction damping member 276 abuts against the head housing 244,
and the second bottom surface 233b of the vibration reduction
damping member 276 abuts against the outer housing 240. More
specifically, the first bottom surface 231a abuts against the outer
surface 274 of the head housing 244, and the second bottom surface
233b abuts against the inner surface 270 of the outer housing 240.
Preferably, the part abutting against the first bottom surface 231a
of the outer surface 274 is planar, and the part abutting against
the second bottom surface 233b of the inner surface 270 is also
planar. More preferably, the vibration reduction damping member 276
and the inner surface 270 of the outer housing 240 are relatively
freely disposed, so that a relative position relationship between
the vibration reduction damping member 276 and the outer housing
240 is not limited. Because of such setting, in a working process
of the oscillating power tool 200, forces applied to the vibration
reduction damping member 276 in directions other than the direction
perpendicular to the middle plane may be reduced, so that fatigue
failure of the vibration reduction damping member 276 is alleviated
and the service life of the vibration reduction damping member 276
is prolonged.
[0075] FIG. 9 is a third implementation of the present invention,
and is a deformation based on the second implementation. In this
embodiment, the interior of a limiting groove 366 is provided with
a step surface 367, that is, an inner wall of the limiting groove
366 is divided into two sections with two different inner
diameters. Further, the inner diameter of one section close to a
head housing 344 of the inner wall of the limiting groove 366 is
relatively small, and the inner diameter of one section close to an
outer housing 340 is relatively large. Further, a limiting damping
member 368 is disposed in the section close to the outer housing
340 in the limiting groove 336. The limiting damping member 368 is
approximately annular cylindrical, and has a through accommodating
hole in the middle, and the accommodating hole is approximately
cylindrical. Further, a limiting member 364 disposed on the outer
housing 340 is also in an approximately cylindrical shape
protruding from an inner surface 370 of the outer housing 340.
After assembly, the limiting member 364 is engaged into the
accommodating hole of the limiting damping member 368.
Specifically, the limiting member 364 completely penetrates through
the accommodating hole of the limiting damping member 368.
[0076] FIG. 10 to FIG. 12 show a fourth implementation of the
present invention.
[0077] Referring to FIG. 10 to FIG. 12, this embodiment is
approximately similar to the first embodiment. In this embodiment,
an oscillating power tool 400 and its general layout are the same
as those in the first embodiment. In the present implementation, a
vibration reduction mechanism and a limiting mechanism are disposed
between a head housing 444 and an outer housing 440. Further, the
vibration reduction mechanisms are symmetrically disposed on two
sides of a middle plane.
[0078] A case in which the vibration reduction mechanism is located
between the head housing 444 and the outer housing 440 and located
on one side of the middle plane is used as an example for
illustration below. The vibration reduction mechanism includes a
vibration reduction damping member 476. The vibration reduction
damping member 476 is disposed between an outer surface 474 of the
head housing 444 and an inner surface 470 of the outer housing 440.
Specifically, the head housing 444 is provided with a flange 475
protruding from the outer surface 474, and the flange 475 encircles
on the outer surface 474 of the head housing 444 to form an
accommodating space. Preferably, two flanges 475 and two
accommodating spaces are respectively disposed along an axial
direction. Preferably, the vibration reduction damping member 476
includes two vibration reduction parts 479, which are disposed
along the axial direction at intervals and are connected by a
connecting part 481. Further, the two vibration reduction parts 479
are respectively disposed in the two accommodating spaces. Because
of such setting, a length requirement of the vibration reduction
damping member in the axial direction can be met without mounting
two vibration reduction damping members, and the assembly process
is simplified. Further, the part abutting against the inner surface
470 of the outer housing 440 of the vibration reduction damping
member 476 is a plane, and the two are relatively freely disposed,
so that a relative position relationship between the vibration
reduction damping member 476 and the outer housing 440 is not
limited. Such setting also aims to prolong service life of the
vibration reduction damping member 476.
[0079] Further, a limiting mechanism is further disposed between
the head housing 444 and the outer housing 440. A longitudinal
extending axis of the outer housing 440 is X1, and an axis of an
output shaft is Y. The longitudinal extending axis X1 of the outer
housing is perpendicular to the axis Y of the output shaft. A
plane, which is perpendicular to the axis of the output shaft and
which the longitudinal extending axis X1 passes through is a
transverse plane. In this embodiment, the limiting mechanisms are
symmetrically disposed on two sides of the transverse plane. A case
in which the limiting mechanism is located between the head housing
444 and the outer housing 440 and located on one side of the middle
plane is used as an example for illustration below. The limiting
mechanism includes a limiting damping member 468. The limiting
damping member 468 has a cylindrical structure with an
approximately U-shaped cross section. The U-shaped cylindrical
structure of the limiting damping member 468 extends along a
direction perpendicular to the middle plane. A recessed part of the
U-shaped cylindrical structure of the limiting damping member 468
is disposed toward the outer housing 440. The outer housing 440 is
provided with a limiting member 464. The limiting member 464 is
disposed in a manner of protruding outwards from the inner surface
470 of the outer housing 440 and is used to be engaged with the
recessed part of the limiting damping member 468. The head housing
444 is further provided with a limiting groove 466. The limiting
damping member 464 is clamped in the limiting groove 466. The
limiting damping member 464, the limiting groove 466 and the
limiting member 464 collaborate with each other to limit movement
of the inner and outer housings along the direction of the
longitudinal extending axis X1 and the direction of the axis Y of
the output shaft. Because of such setting of the limiting
mechanism, the length along the direction perpendicular to the
middle plane is longer, so that a limiting effect of the limiting
damping member is better.
[0080] The limiting function of the limiting mechanism to relative
movement between the inner housing and the outer housing in the
foregoing second to fourth implementations is the same as that in
the first implementation, and therefore, if a material with
relatively large rigidity is used, the operation performance of the
oscillating power tool can be improved, so that the user can more
easily operate the oscillating power tool to smoothly feed the work
head. Moreover, the vibration reduction mechanism can also provide
a vibration reduction force in the direction the same as that of
the vibration reduction mechanism in the first implementation, that
is, an action direction of the vibration reduction mechanism is the
same as the action direction of the vibration reduction mechanism
in the first implementation, and therefore, the vibration of the
oscillating power tool in an oscillating direction can be
effectively reduced.
[0081] In the foregoing implementations, the limiting mechanism and
the vibration reduction mechanism are relatively independently
disposed. In this way, the most appropriate shapes, sizes,
materials, numbers, and the like of the vibration reduction damping
member and the limiting damping member may be selected according to
respective functions thereof.
[0082] Therefore, the vibration reduction effect is ensured without
affecting the working efficiency. Besides, the vibration reduction
damping member and the limiting damping member are more flexible to
dispose, and the oscillating power tool is more compact in
structure and better in man-machine interaction.
[0083] The present invention is not limited to the implementations
in the foregoing embodiments, and those skilled in the art may
possibly make other changes in light of the teaching of the
technical essence of the present invention, and the changes should
fall within the protection scope of the present invention as long
as the functions implemented by the changes are the same as or
similar to those of the present invention.
* * * * *